Doctor Elizabeth 'Liz' Shaw
played by Caroline John
After strange meteorites started appearing Doctor Liz Shaw was drafted in as UNIT's scientific adviser, until the newly regenerated Doctor was found.
Liz Shaw was the first, and to date only, companion never to have travelled in the TARDIS. She left UNIT to continue her academic career. There was no proper leaving party.
- Dust Breeding as Madame Salvadori